Harpa harpa Linnaeus, 1758
The Family Harpidae Of The World, H. Rehder. 1973.
Rehder, Harold A. 1973. The Family Harpidae of the World. Indo-Pacific Mollusca, Volume 3, No. 16. Delaware Museum of Natural History.
Here is a list of the Harpa species addressed by Rehder and the "accepted" species addressed 31 and 42 years later.
T1 = the first teleoconch whorl after the protoconch
T2 = the second teleoconch whorl (antepenultimate whorl)
T3 = the third teleoconch whorl (penultimate whorl)
T4 = the body (adult) whorl.